Terahertz time-domain spectroscopy (THz-TDS) is used to study the spectral response of lithium niobate crystals (LiNbO 3 ) in the far infrared region. The optical constants are derived from the measured complex refractive index. A giant birefringence is observed in this material, and the average refractive-index difference between the ordinary wave and the extraordinary wave, n o − n e , can reach up to about 1.6. Such a large birefringence is attributed to the different phonon modes of A 1 ( z ) and E ( x , y ). This unusual property makes LiNbO 3 a promising material to be used as a functional material in the terahertz region, e.g. employed as wave-plates and polarization separators.
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Sun et al. (2007) studied this question.
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